(1)is the science of hiding information.Where as the goal of cryp to graphy is to make data unreadable by a third party.the goal of steganography is to hide the data from a third party.In this article,I will discuss what steganography is,what purposes it serves,and will provide an example using available software. There are a large number of steganographic(2)that most of us are familiar with(especially if you watch a lot of spymovies),ranging from invisible inkandmicrodotstosecretingahiddenmessageinthesecondletterofeachwordofalargebodyoftextandspreadspectrumradiocommunication.With computersandnetworks,there arem any other ways of hiding informations,suchas: Covertchannels(c,g,Lokiandsomedistributeddenial-of-servicetoolsusetheInternetControl(3)Protocol,orICMP,asthecommunicationchannelbetweenthe“badguy”andacompromicyedsystem) HiddentextwithinWebpages Hidingfilesin“plainsight”(c,g.whatbetterplaceto“hide”afilethanwithanimportantsoundingnameinthec:\winntsystem32directory) Nullciphers(c,g,usingthefirstletterofeachwordtoformahiddenmessageinanotherwiseinnocuoustext) steganographytoday,however,issignificantlymore(4)than the example about suggest,allowing ausertohidelargeamountsofinformationwithinimageandaudio.Theseformsofsteganographyoftenareusedinconjunctionwith cryptographysothe information is double protected;firstitisencryptedandthenhiddensothatanadvertisementfirst.find the information(an often difficult task inandofitself)and the decryptedit. The simple stapproachtohidingdatawithinanimagefileiscalled(5)signatureinsertion.In this method,we can take the binaryrepresentationofthehiddendataandthebitofeachbytewithinthecovertimage.If weareusing 24-bitcolor the amount and will be minimum and indiscriminate to the human eye.
A.Cryptography
B.Geography
C.Stenography
D.Steganography@@@SXB@@@A.methods
B.software
C.tools
D.services@@@SXB@@@A.Member
B.Management
C.Message
D.Mail@@@SXB@@@A.powerful
B.sophistication
C.advanced
D.easy@@@SXB@@@A.least
B.most
C.much
D.less
第1题:
下列可以打开随机文件的语句是( )。
A.Open”filel.dat”For Input As#1
B.Open”filel.dat”For Append As#1
C.Open”filel.dat”For Output As#1
D.Open”filel.dat”For Randow As#1 Len=20
第2题:
已知:DAT1 LABEL BYTEDAT2 DW 0ABCDH 依次执行SHL DAT1,1和SHR DAT2,1指令后,DAT2字存储单元中的内容是:
A.AF34H
B.55CDH
C.55E6H
D.ABCDH
第3题:
________ your plans with a college counselor helps you define your goal and improve your career plans or make them work.
A Talking into
B Talking up
C Talking over
D Talking on
第4题:
已知: DAT1 LABEL BYTE DAT2 DW 0ABCDH 依次执行SHL DAT1,1和SHR DAT2,1指令后,DAT2字存储单元中的内容是( )。
A.AF34H
B.55CDH
C.55E6H
D.ABCDH
第5题:
要在D盘的Temp 目录下建立一个名为NamE.dat 的顺序文件,应使用______语句。
A.Open "NamE.dat" For Output As #1
B.Open "NamE.dat" For Input As #1
C.Open "D:\Temp\NamE.dat" For InputAs #1
D.Open "D:\Temp\NamE.dat" For Output As #1
第6题:
Software engineering is the science and art of specifying, designing, implementing, and(66)with economy, timeliness and elegance, programs,(67)and operating procedures whereby computers can be made useful to humanity.
This definition implicitly sets(68)the basic goal of software engineering research and development: The basic goal of software engineering is to facilitate specification, design, implementation and evolution of programs, documentation and operating(69)which are useful to humanity in an economic,(70)and elegant manner(using the appropriate science and art).
A.envelopment
B.enveloping
C.evolvement
D.evolving
第7题:
A.fp=fopen(“w 1.dat”,“r+”);
B.fp=fopen(“w 1.dat”,“w+”);
C.fp=fopen(“E:\\w 1.dat”,“r+”);
D.fp=fopen(“E:\\w 1.dat”,“w+”);
第8题:
第9题:
第10题:
To achieve the goal,Enable anonymous authentication should be enabled for the Web application
To achieve the goal,the RSS setting should be changed for the document library
To achieve the goal,the permissions should be changed for the document library
To achieve the goal,the incoming e-mail settings should be changed for the document library
第11题:
cultural groups that are formed by scientists
people whose knowledge of science is very limited
the scientific community
people who make good contribution to science
第12题:
第13题:
(34)如果准备读文件,打开随机文件“text.dat”d的正确语句是 A.Open"text.dat"For Write As#1 B.Open"text.dat"For Binary As#1 C.Open"text.dat"For Input As#1 D.Open"text.dat"For Random As#1
第14题:
A.DAT1的第1个数据
B.DAT1的偏移地址
C.DAT1的段地址
D.DAT1的物理地址
第15题:
To be inspired by other people's creativity,children should______.
A.write ideas
B.make up stories
C.buy good notebooks
D.visit museums,libraries,and science centers
第16题:
如果准备读文件,打开顺序文件”text.dat”的正确语句是( )。
A.Open"text.dat"For Write As#1
B.Open"text.dat"For Binary As#1
C.Open"text.dat"For Input As#1
D.Open"text.dat"For Random As#1
第17题:
下列可以打开随机文件的语句是( )。
A.Open"file 1.dat"For Input As#1
B.Open"file1.dat"For Append As#1
C.Open"file1.dat"For Output As#1
D.Open"file1.dat"For Randow As#1 Len=20
第18题:
执行下面的程序段后,DAT1单元的值是( )。 DAT1 DB 12H,34H DAT2 DB 56H,78H MOV AX, WORD PTR DAT1 CMP AX, WORD PTR DAT2 JA DONE MOV BX, WORD PTR DAT2 MOV OWRD PTR DAT2,AX MOV OWRD PTR DAT1, BX DONE: HLT
A.34H
B.78H
C.12H
D.56H
第19题:
第20题:
如果准备读文件,打开顺序文件“text.dat”的正确语句是()。
Aopen ”text.dat” For write As # 1
Bopen ”text.dat” For Binary As # 1
Copen ”text.dat” For Input As # 1
Dopen ”text.dat” For Random As # 1
第21题:
第22题:
open ”text.dat” For write As # 1
open ”text.dat” For Binary As # 1
open ”text.dat” For Input As # 1
open ”text.dat” For Random As # 1
第23题:
用DAT1表示02H
定义DAT1为变量,其初值为02H
从标号DAT1对应的地址起02H个单元被分配
定义DAT1为变量,其地址为0002H